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1 The first two box instructions occur in the initial calls to listAdd() The signature for the ArrayList method is int Add(object value) As such, any value type passed to this method is boxed 2 Next are two unbox instructions in the call to Add() within the for loop The return from an ArrayList's index operator is always object because that is what ArrayList collects In order to add the two values, however, you need to cast them back to doubles This cast back from an object to a value type is an unbox call 3 Now you take the result of the addition and place it into the ArrayList instance, which again results in a box operation Note that the first two unbox instructions and this box instruction occur within a loop 4 In the foreach loop, you iterate through each item in ArrayList and assign them to count However, as you already saw, the items within ArrayList are objects, so assigning them to a double is unboxing each of them 5 The signature for ConsoleWriteLine() that is called within the foreach loop is void ConsoleWrite(string format, object arg) As a result, each call to it invokes a box operation back from double and into object Obviously, you can easily improve this code by eliminating many of the boxing operations Using an object rather than double in the last foreach loop is one improvement you can make Another would be to change the ArrayList data type to one that supports a concept known as generics (see 12) The point, however, is that boxing can be rather subtle, so developers need to pay special attention and notice situations where it could potentially occur repeatedly and affect performance There is another unfortunate runtime-boxing-related problem If you wanted to change the initial two Add() calls so that they did not use a cast (or a double literal), you would have to insert integers into the array list Since int s will implicitly cast to doubles, this would appear to be an innocuous modification However, the casts to double from within the for loop, and again in the assignment to count in the foreach loops, would fail The problem is that immediately following the unbox operation is an attempt to perform a memory copy of the int into a double You cannot do this without first casting to an int , because the code will throw an InvalidCastException at execution time Listing 86 shows a similar error commented out.

[1] Besides configuring the assembly with regsvcs, you should not forget to install the assembly into the global assembly cache Some services require the assembly in the global assembly cache

best practices for building Web-based applications in C# Finally, it is useful to know what accessors are available when you are authoring controls You have direct access the topics explored in depth through the Page property and to the current HttpContext through Among to your containing Page classare: the Context property The Parent property can be used to query your immediate parent control The remaining elements of the Control class are discussed as we explore control implementation techniques in more ASPNET architecture detail next Web forms

// int number; object thing; double bigNumber; number = 42; thing = number; // ERROR: InvalidCastException // bigNumber = (double)thing; bigNumber = (double)(int)thing; //

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Although you can completely render your control by using only the Write method of the HtmlTextWriter HTTP pipeline class, many other methods are available that can both simplify rendering and make the output more browser generic Internally, handling Diagnostics and error all the Web controls defined in the SystemWebUI hierarchy use the HTMLrendering methods of the HtmlTextWriter class to generate their output This class can be used in three ways to generate HTML output First, you can use the overridden versions of Write and WriteLine to Validation generate whatever text you need into the response buffer Second, you can use the non-stack-based convenience methods, such as WriteBeginTag and WriteEndTag, to generate each HTML element Data binding programmatically instead of generating string literals The third, and most appealing, way is to use the Custom controls stack-based methods, such as RenderBeginTag and RenderEndTag, for easily constructing blocks of nested HTML elements Listing 8-6 shows the core methods of the HtmlTextWriter class, grouped into Caching methods you would use for each of the three rendering techniques supported by the class

The utility regsvcsexe is a NET program that uses the classesRegistrationConfig and RegistrationHelper to register the assembly The automatic registration process uses the same classes to configure the components, although you can use these classes yourself if you're creating a custom registration program Table 13-2 shows the properties of the RegistrationConfig class, which defines the configuration options used by theRegistrationHelper class The properties of this class have similar meanings to the options of the regsvcs utility

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